US4513850A - Electrohydraulic power shift transmission system - Google Patents
Electrohydraulic power shift transmission system Download PDFInfo
- Publication number
- US4513850A US4513850A US06/465,156 US46515683A US4513850A US 4513850 A US4513850 A US 4513850A US 46515683 A US46515683 A US 46515683A US 4513850 A US4513850 A US 4513850A
- Authority
- US
- United States
- Prior art keywords
- switch
- operated
- relay
- clutch
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/06—Control by electric or electronic means, e.g. of fluid pressure
- F16D48/066—Control of fluid pressure, e.g. using an accumulator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/06—Control by electric or electronic means, e.g. of fluid pressure
- F16D48/062—Control by electric or electronic means, e.g. of fluid pressure of a clutch system with a plurality of fluid actuated clutches
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
- F16D2048/0257—Hydraulic circuit layouts, i.e. details of hydraulic circuit elements or the arrangement thereof
- F16D2048/0281—Complex circuits with more than two valves in series or special arrangements thereof not provided for in previous groups
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/10—System to be controlled
- F16D2500/102—Actuator
- F16D2500/1021—Electrical type
- F16D2500/1023—Electric motor
- F16D2500/1024—Electric motor combined with hydraulic actuation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/10—System to be controlled
- F16D2500/11—Application
- F16D2500/1107—Vehicles
- F16D2500/111—Agricultural
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/10—System to be controlled
- F16D2500/11—Application
- F16D2500/1107—Vehicles
- F16D2500/1112—Heavy vehicle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/30—Signal inputs
- F16D2500/314—Signal inputs from the user
- F16D2500/31406—Signal inputs from the user input from pedals
- F16D2500/31413—Clutch pedal position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/30—Signal inputs
- F16D2500/314—Signal inputs from the user
- F16D2500/3146—Signal inputs from the user input from levers
- F16D2500/31466—Gear lever
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/70—Details about the implementation of the control system
- F16D2500/704—Output parameters from the control unit; Target parameters to be controlled
- F16D2500/70402—Actuator parameters
- F16D2500/7041—Position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/70—Details about the implementation of the control system
- F16D2500/704—Output parameters from the control unit; Target parameters to be controlled
- F16D2500/70464—Transmission parameters
- F16D2500/70488—Selection of the gear ratio
Definitions
- This invention relates to a power shift transmission and, more particularly, to a solenoid operated directional valve selectively operating modulating valves for the high/low ranges of the transmission and automatic downshifting of the power shift transmission when the control valve is in the inching position.
- Power shift transmissions operate by selectively shifting hydraulic clutches for selectively engaging and disengaging speed ratios. Shifting can be accomplished while the vehicle is moving since a degree of slippage between the friction disks on the hydraulic clutch is tolerated.
- a combination of a power shift transmission and a manually operated transmission have been used whereby the manual transmission provides a multiple of gear speeds and the power shift transmission provides the added advantage of upshifting and downshifting, while the vehicle is moving.
- the size of the transmission can be kept relatively small by the use of this combination and still provide a multiple speed transmission.
- the applicant's invention provides a similar two speed power shift transmission in which the control for the directional valve is through an electrical switch associated with the clutch pedal.
- the switch is normally closed when the clutch pedal is in its nondepressed condition.
- the circuit is opened and a spring in the solenoid operated directional valve shifts the directional valve to engage the low speed modulating valve to engage the low speed clutch.
- the objects of this invention are accomplished in a multiple speed vehicle transmission having a power shift to automatically downshift when the manual clutch is operated for inching.
- An electrical control operating responsive to movement of the manual clutch pedal, selectively operates a solenoid operated directional valve to selectively engage the low speed modulating valve.
- the switch opens to downshift the directional valve and engage the low speed range of the power shift transmission.
- the directional valve is solenoid operated providing communication between the control valve and the low speed modulating valve to engage the low speed hydraulic clutch in the power shift transmission.
- FIG. 1 illustrates a side elevation view of the clutch pedal mounted at the operator station in a tractor
- FIG. 2 is a rear view of the clutch pedal and control linkage as shown in FIG. 1;
- FIG. 3 is a side elevation view partially in cross-section of the manually operated control valve in the retracted position
- FIG. 4 is a cross-section view of the directional valve and two modulating valves with the high speed modulating valve in operation;
- FIG. 5 is a side elvation view partially in section of the manually operated control valve in the position with the clutch pedal partially depressed;
- FIG. 6 is a cross-section view of the directional valve and the two modulating valves with a low speed modulating valve operating as when the control valve is inching;
- FIG. 7 is a schematic view of the hydraulic system including the control valve, the directional valve and two modulating valves.
- the clutch pedal 1 is pivotally mounted on a shaft 2 which is carried on a support bracket 3 carried on the fire wall 4 at the operator station 5.
- the clutch pedal 1 is biased to a return position by the return spring 6 connected to an arm 7 of the clutch pedal 1 and a spring seat 8 on the bracket 9 supported on the fire wall 4.
- the arm 7 is pivotally connected to a link 10 which in turn is pivotally connected to an arm 11 of lever 110.
- the lever 110 is pivotally mounted on a fore and aft shaft 12.
- the lever 110 is also formed with an arm 13 pivotally connected to a link 14 which operates in a dampening device 15 which is also carried on a bracket 3 supported on the fire wall 4.
- the shaft 12 extends through the bearing 16 and through the fire wall 4 and carries an arm 116.
- the arm 116 is pivotally connected through a clevis 17 to the sheathed cable 18 reciprocating in the sheath 19.
- the sheath 19 is mounted on the anchor 20.
- Electrical switch 21 is mounted on the bracket 22 and operated by an abutment 23. Normally this switch 21 is closed when the clutch pedal 1 is in the retracted or up position. The switch opens when the clutch pedal 1 is depressed.
- the sheathed inner cable 18 extends downwardly to the clevis 25 which is pivotally connected to the lever 26.
- the lever 26 is pivotally mounted on a bracket 27 supported on a fluid supply control valve 28.
- the control valve 28 defines a pressure chamber 29 in communication with a conduit 30 which is connected to the pump 90.
- the chamber 29 is connected to a relief valve 31 allowing fluid to pass through the chamber 32 to a cooler 93, filter 94 and to sump 92.
- the relief valve 34 allows fluid to pass through the sump chamber 35 and through conduit 36 to sump 92 when oil is cold.
- the chamber 29, as shown in FIG. 3, is in communication with the chamber 136 which is in communication through the conduit 199 to directional valve 45 and modulating valves 47 and 48 for operating clutches and a brake.
- a fluid flow control element in the form of a spool 39 is mechanically operated by the lever 26 operating against the spring seat 40 biasing a spring 41 against spool flange 42.
- the flanges 142 and 43 compress spring 44 for operation of the spool for overtravel protection.
- the fluid supply valve 28 is hydraulically connected to the the valve housing 46 which houses a pilot operated low speed modulating valve 47 and a pilot operated high speed modulating valve 48.
- a directional valve 45 secured to the housing 46 includes a solenoid 49 having a coil 51 and electrical terminals 52 and 53 for connecting the solenoid valve in an electrical circuit which will subsequently be described.
- the low speed range modulating valve 47 is shown in operation in FIG. 6 in which the accumulator 54 forms an expansible chamber 55.
- the plunger or piston 56 is biased to a minimum volume position by the spring 57.
- the spool spring 58 also biases the spool 59 in the left-hand direction.
- the reducing valve 60 includes a flow control element or spool 59 which has a central opening 61 and radial opening 62 to allow pressurized fluid from conduit 37 and chamber 63 to flow into the pressure reducing valve 60. Fluid in the pressure chamber 63 is allowed to flow through the radial opening 62 in the central opening 61 and out of the conduit 64 to the low speed hydraulic clutch 65. Similarly, an accumulator 66, which includes the plunger or piston 67, is biased to a minimum volume position by the spring 68 to form a variable volume chamber 69. A flow control element or spool 70 for controlling the flow of fluid to and from the high speed clutch 75 is also biased in the left-hand direction by the spool spring 71 for connecting the high speed clutch 75 to sump.
- a flow control element or spool 59 which has a central opening 61 and radial opening 62 to allow pressurized fluid from conduit 37 and chamber 63 to flow into the pressure reducing valve 60. Fluid in the pressure chamber 63 is allowed to flow through the radi
- a radial port 72 is open in the position shown in FIG. 4 for the high speed modulating valve 48.
- the central opening 73 is in communication with the conduit 74 and the high speed clutch 75.
- the directional valve 45 is a solenoid operated valve and pressurized fluid in conduit 199 flows to the pressure chamber 76. In the position as shown in FIG. 4, pressurized fluid in chamber 76 is allowed to flow through the passage 178 to the expansible chamber 69. A solenoid valve is held in this position responsive to the solenoid coil 51 which is energized and the armature 80 is drawn to the core 81.
- the clutch pedal 1 is depressed pivoting the lever 26 on its pivotal axis 82 to withdraw spool 39 to the position for throttling fluid from the chamber 29 to the chamber 136. Continued movement of the spool 39 will disengage whichever one of the clutches 65, 75 is engaged by dumping the fluid in the clutch supply conduit 37.
- the clutch control switch 21 is allowed to open. Opening of the switch 21 deenergizes the solenoid 49 in the directional valve (in the event the high speed clutch 75 is engaged at the time the clutch pedal is depressed) allowing the spring 79 to bias the armature 80, which includes a shiftable valve element, to the extended position as sown in FIG. 6. Opening of the switch 21 causes the directional valve to connect supply conduit 199 with the expansible chamber 55 operating the modulating valve 47 so when pedal is released the low clutch 65 will be energized and inching will progress.
- the pump 90 pressurizes fluid in the conduit 30 which is applied to the manual control valve 28.
- the relief valve 31 allows excess fluid to flow through cooler 93.
- Relief valve 34 allows fluid to return to sump 92 under cold oil conditions.
- FIG. 6 illustrates the electrical diagram in which the battery 95 is connected through the clutch switch 21 to a manual control switch 85.
- a manual control member or lever 101 of the manual control switch 85 is biased to a neutral position as indicated.
- the switch lever 101 returns to this position when released manually.
- the switch lever 101 can be moved downwardly to the low position to de-energize the solenoid valve and thereby place the directional valve to the low range position.
- the solenoid directional valve 45 is connected through series connected switches 21 and 85.
- the switch 85 shown in FIG. 6, can be operated manually to cause the directional valve 45 to direct fluid to one or the other of the clutches 65, 75 by way of the modulating valves 47 or 48. Operation of the manual control switch 85 to the high speed range position energizes the relay coil 99 to hold the relay switch 100 in the closed position which energizes solenoid 49.
- the manual control switch 85 is moved to the low position which deenergizes the relay coil 99 and the solenoid coil 51 of the directional valve 45.
- the lever 101 is then allowed to return to the neutral position as illustrated in solid lines. Deenergizing of the relay coil 99 and returning the lever 101 to the neutral position deenergizes the solenoid coil 51 allowing the spring 79 to bias the armature 80 downwardly to a position directing pressure fluid to accumulator 55 of the low speed modulating valve 47.
- the solenoid valve is automatically placed in a low speed operating mode when the clutch pedal 1 is depressed as when inching the tractor. Depressing the clutch pedal 1 opens the switch 21 which, in turn, deenergizes the relay coil 99 of the relay 105 and also deenergizes the solenoid coil 51. With the solenoid coil 51 deenergized, spring 79 biases the armature 80 to a position allowing the low speed modulating valve 47 to direct pressure fluid to the clutch actuating hydraulic circuit or conduit 64.
Abstract
Description
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/465,156 US4513850A (en) | 1983-02-09 | 1983-02-09 | Electrohydraulic power shift transmission system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/465,156 US4513850A (en) | 1983-02-09 | 1983-02-09 | Electrohydraulic power shift transmission system |
Publications (1)
Publication Number | Publication Date |
---|---|
US4513850A true US4513850A (en) | 1985-04-30 |
Family
ID=23846707
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/465,156 Expired - Fee Related US4513850A (en) | 1983-02-09 | 1983-02-09 | Electrohydraulic power shift transmission system |
Country Status (1)
Country | Link |
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US (1) | US4513850A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4632234A (en) * | 1983-12-03 | 1986-12-30 | Dr. Ing.h.c.f. Porshe Aktiengesellschaft | Control system for a double clutch of a power-shiftable motor vehicle transmission |
US4718310A (en) * | 1984-11-22 | 1988-01-12 | Toyota Jidosha Kabushiki Kaisha | Shift control system of automatic transmission for vehicle |
EP0399399A1 (en) * | 1989-05-26 | 1990-11-28 | IVECO FIAT S.p.A. | Actuator device particularly suited to activating the friction clutch of a motor vehicle |
FR2692942A1 (en) * | 1992-06-25 | 1993-12-31 | Valeo | Electro-hydraulic actuator, particularly for controlling a motor vehicle clutch. |
JP2014194229A (en) * | 2013-03-28 | 2014-10-09 | Honda Motor Co Ltd | Clutch control device in vehicle power unit |
EP3203121A4 (en) * | 2014-09-29 | 2018-05-30 | Isuzu Motors Limited | Clutch connection/disconnection device for dual clutch transmission |
CN112879457A (en) * | 2021-01-04 | 2021-06-01 | 广东博智林机器人有限公司 | Clutch control device and agricultural machine |
US11607950B2 (en) | 2020-05-14 | 2023-03-21 | Cnh Industrial America Llc | Transmission system for a work vehicle |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3382769A (en) * | 1966-04-04 | 1968-05-14 | Navy Usa | Digital hydraulic actuator |
US3808810A (en) * | 1972-12-22 | 1974-05-07 | Allis Chalmers | Hydraulic modulating valve |
US4376473A (en) * | 1981-03-26 | 1983-03-15 | International Harvester Co. | Multiple clutch control system |
US4380278A (en) * | 1981-03-06 | 1983-04-19 | International Harvester Co. | Multiple clutch control system employing clutch status monitor |
US4416358A (en) * | 1981-05-21 | 1983-11-22 | General Motors Corporation | Electro-hydraulic control for a transmission having a torque converter clutch |
-
1983
- 1983-02-09 US US06/465,156 patent/US4513850A/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3382769A (en) * | 1966-04-04 | 1968-05-14 | Navy Usa | Digital hydraulic actuator |
US3808810A (en) * | 1972-12-22 | 1974-05-07 | Allis Chalmers | Hydraulic modulating valve |
US4380278A (en) * | 1981-03-06 | 1983-04-19 | International Harvester Co. | Multiple clutch control system employing clutch status monitor |
US4376473A (en) * | 1981-03-26 | 1983-03-15 | International Harvester Co. | Multiple clutch control system |
US4416358A (en) * | 1981-05-21 | 1983-11-22 | General Motors Corporation | Electro-hydraulic control for a transmission having a torque converter clutch |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4632234A (en) * | 1983-12-03 | 1986-12-30 | Dr. Ing.h.c.f. Porshe Aktiengesellschaft | Control system for a double clutch of a power-shiftable motor vehicle transmission |
US4718310A (en) * | 1984-11-22 | 1988-01-12 | Toyota Jidosha Kabushiki Kaisha | Shift control system of automatic transmission for vehicle |
EP0399399A1 (en) * | 1989-05-26 | 1990-11-28 | IVECO FIAT S.p.A. | Actuator device particularly suited to activating the friction clutch of a motor vehicle |
US5036965A (en) * | 1989-05-26 | 1991-08-06 | Iveco Fiat S.P.A. | Actuator device particularly suited to activating the friction clutch of a motor vehicle |
FR2692942A1 (en) * | 1992-06-25 | 1993-12-31 | Valeo | Electro-hydraulic actuator, particularly for controlling a motor vehicle clutch. |
EP0577482A1 (en) * | 1992-06-25 | 1994-01-05 | Valeo | Electrohydraulic actuator especially for controlling a motor vehicle clutch |
JP2014194229A (en) * | 2013-03-28 | 2014-10-09 | Honda Motor Co Ltd | Clutch control device in vehicle power unit |
EP3203121A4 (en) * | 2014-09-29 | 2018-05-30 | Isuzu Motors Limited | Clutch connection/disconnection device for dual clutch transmission |
US10174796B2 (en) | 2014-09-29 | 2019-01-08 | Isuzu Motors Limited | Clutch connection/disconnection device for dual clutch transmission |
US11607950B2 (en) | 2020-05-14 | 2023-03-21 | Cnh Industrial America Llc | Transmission system for a work vehicle |
CN112879457A (en) * | 2021-01-04 | 2021-06-01 | 广东博智林机器人有限公司 | Clutch control device and agricultural machine |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ALLIS-CHALMERS CORPORATION,BOX 512 MILWAUKEE, WI Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PLATE, JOHN R.;REEL/FRAME:004093/0274 Effective date: 19830207 |
|
AS | Assignment |
Owner name: DEUTZ-ALLIS CORPORATION BOX 933, MILWAUKEE, WI 53 Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ALLIS-CHALMER CORPORATION A DE CORP;REEL/FRAME:004434/0722 Effective date: 19850627 |
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FPAY | Fee payment |
Year of fee payment: 4 |
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FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
AS | Assignment |
Owner name: WHIRLPOOL FINANCIAL CORPORATION, A DE CORP., MICHI Free format text: SECURITY INTEREST;ASSIGNOR:DEUTZ-ALLIS CORPORATION;REEL/FRAME:005356/0744 Effective date: 19900621 |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 19930502 |
|
AS | Assignment |
Owner name: ITT COMMERCIAL FINANCE CORPORATION, MISSOURI Free format text: SECURITY INTEREST;ASSIGNORS:AGCO CORPORATION;HESSTON CORPORATION;GLEANER-ALLIS CORPORATION ARE COLLECTIVELY THE DEUTZ-ALLIS CORPORATION;REEL/FRAME:006858/0954 Effective date: 19920302 |
|
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |